Stone grinding and polishing machine



FIG. 1 is a perspective view;

FIGS. 2 and 3 are front and rear views respectively;

FIGS. 4 and 5 are a top plan and bottom views respectively; and,

FIGS. 6 and 7 are left-side and right-side views respectively. 

The ornamental design for a stone grinding and polishing machine, as shown. 